add socket.io server and client.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
integrate socket client with backbone.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
remove fetch data in loop.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
update socket io client and callback.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>